Compare means calculator

Welch's t-test calculator

Run a Welch two-sample t-test for unequal variances, with t, degrees of freedom, p-value, effect size, confidence interval, and APA-ready language.

Run this test in StatLab Use @statlab/core

When to use it

Use when two independent groups may have different variances or sample sizes.

Inputs

  • Group A numeric values
  • Group B numeric values
  • Confidence level
  • Alternative hypothesis

Reporting cautions

  • Inspect outliers before treating the mean as representative.
  • Report the Welch degrees of freedom rather than forcing pooled-variance assumptions.

Technical teams

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